One of my favorite churches started several years ago as a ministry to ex-prisoners who were transitioning back into society. Now the church flourishes with people from all walks of life. I love that church because it reminds me of what I picture heaven will be like—filled with different kinds of people, all redeemed sinners, all bound together by the love of Jesus.

Sometimes, though, I wonder if church seems more like an exclusive club than a safe-haven for forgiven sinners. As people naturally gravitate into groups of “a certain kind” and cluster around those they feel comfortable with, it leaves…